A stacked structure of a power converter is disclosed. The stacked structure has a power conversion circuit that provides an output or input of alternating current in three phases and is composed of odd-numbered parallel-connected power semiconductor element modules for each phase, and a heat sink for cooling the power semiconductor element modules. An odd number of the parallel-connected power semiconductor element modules are arranged in a first phase and a third phase, and an even number of the parallel-connected power semiconductor element modules are arranged in a second phase respectively in two rows on the heat sink relative to a ventilation direction of air for cooling the heat sink.